I have a colleague from Turkey who will emphatically tell anyone who asks this question, "There is no real Turkish food in Portland." He recommends Ya Hala, though, as the Middle Eastern restaurant that comes the closest.
The owner is Turkish and was also offering cooking classes! While you are there, take $4 and hand it to the owners of Dosirak in exchange for some of the most delicious gyoza (dumplings) I've ever had!
I haven't tried Secret Kebab yet, but I have to say his twitter feed is awesome. For example, one of my favorites recently: "I am for the market!! Which kind of green leafs you wil want on kebab this night?! Lettuce I wil not in winter!! Strong leafs only!!"